METHOD FOR MANUFACTURING CATHODE ACTIVE MATERIAL, CATHODE ACTIVE MATERIAL, AND LITHIUM SECONDARY BATTERY INCLUDING SAME

Title:

METHOD FOR MANUFACTURING CATHODE ACTIVE MATERIAL, CATHODE ACTIVE MATERIAL, AND LITHIUM SECONDARY BATTERY INCLUDING SAME

Document Type and Number:

WIPO Patent Application WO/2013/062313

Kind Code:

A1

Abstract:

The present invention relates to a method for manufacturing a cathode active material and a cathode active material obtained by the manufacturing method, the method including the steps of: (S1) forming a cell unit, which is a coating layer including a carbon material, on a surface of a core unit including silicon oxide particles, thereby manufacturing a core-cell structured silicon oxide-carbon composite; (S2) forming a silicon oxide-lithium alloy by mixing and heat-processing the silicon oxide-carbon composite with lithium salt including oxygen, thereby manufacturing a core-cell structured (SiOx-Liy)-C (0 < x < 1.5, 0 < y < 4) composite; and (S3) cleaning and drying the surface of the manufactured core-cell structured (SiOx-Liy)-C composite. According to the method for manufacturing a cathode active material which is a core-cell structured (SiOx-Liy)-C composite of the present invention, since a coating layer of a carbon material is included on the surface of a silicon oxide core, oxygen of lithium salt including the oxygen is prevented from being infiltrated into silicon oxide, so that it is easy to control the proportion of oxygen in the silicon oxide. Also, the cathode active material of the present invention is subjected to a process of removing a residual lithium source and a byproduct generated by a reaction between a lithium source and silicon oxide, thereby preventing the slurry of the cathode active material from gelling. In addition, the cathode active material of the core-cell structured (SiOx-Liy)-C composite according to the manufacturing method of the present invention has a high capacity, excellent lifetime characteristic, and capability to control the thickness of swelling.

Inventors:

LEE MI-RIM (KR)
LEE YONG-JU (KR)
KIM JE-YOUNG (KR)
JUNG HYE-RAN (KR)

Application Number:

PCT/KR2012/008771

Publication Date:

May 02, 2013

Filing Date:

October 24, 2012

Export Citation:

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Assignee:

LG CHEMICAL LTD (KR)

International Classes:

H01M4/139; H01M4/38; H01M4/48; H01M4/583; H01M4/587; H01M10/052

Domestic Patent References:

WO2011030486A1	2011-03-17
WO2010146759A1	2010-12-23

Foreign References:

KR20080074157A

2008-08-12

Other References: